1片LMD18200可以控制（）台直流电机的正反转。 A.1 B.2 C.3

在下列股骨髁骨折的治疗中，哪项不正确（）

A.为了使内固定牢固，术后不要过早活动

B.要达到解剖复位

C.术后要早期活动

D.术后应使用持续被动关节活动器

E.要进行牢固坚实的内固定

Child labor — the employment of children in industry, often against their will — has been a problem for many years. Over a hundred years ago, Charles Dickens shocked many of his readers when he described the conditions under which young children worked in British factories. The conditions Dickens described continue almost unchanged today in many parts of the world. The only difference is that today employment of children is confined（limited）to small industries and family businesses, such as hotels, restaurants and particularly farms, rather than to large factories.

Girls suffer more from child labor practices than boys. Many of them are forced to start work when they are only ten years old. Although the work they are given to do is often light, it is often harmful to the health. Recently, children as young as six years were found to be working in Asian factories, and the children were working from eight to fourteen hours a day in overcrowded and unhealthy working conditions. Sometimes a whole family group is employed, with the payment going to a parent or older relative. The children not only receive nothing or very little for their long hours of work, but also they are prevented from attending school. Therefore, when they become older they are unable to do any other kind of work.

The solution to the problem of child labor is clearly better laws to protect young children, greater supervision（监督）of industry and heavier fines for those who break the laws. Only in this way can young boys and girls be allowed to enjoy the most valuable time of their lives—childhood.

小题1:Which’s the main idea of the first paragraph?

A．Children are often willing to work in large factories.

B．Most children are working in British factories.

C．The poor working conditions of child labor in Dickens’ novel.

D．The working conditions for children are similar to those a hundred years ago.小题2:Girls’ work is ____.

A．not harmful to the health though it is heavy

B．not harmful to the health because it is light

C．harmful to the health though it is light.

D．harmful to the health because it is heavy小题3:Young children go to work ____.

A．because they are forced to

B．in order to be skillful in a certain kind of work

C．in order to be paid well

D．in order to earn money for education小题4:To solve the problem of child labor, the writer suggests the following BUT ____.

A．looking over factories more closely

B．raising their payment and improving the system of education

C．improving laws of protecting children’s interests

D．punishing lawbreakers with severer fines

男，29岁。低热、乏力、咳嗽、咳痰及痰中带血丝2年。胸片显示双肺片状阴影，轮廓模糊。进一步应做（）

A.结核菌素试验

B.痰细胞学检查

C.支气管镜检查

D.支气管碘油造影

E.经胸壁穿刺活组织检查

关系数据模型通常由哪几部分组成 ( )

A．数据结构、关系操作、完整性约束

B．数据通信、关系操作、完整性约束

C．数据结构、关系操作、实体联系模型

D．数据通信、数据模型、完整性约束

Clattering keyboards may seem the white noise of the modern age, but they betray more information than unwary typists realize. Simply by analyzing audio recordings of keyboard clatter, computer scientists can now reconstruct an accurate transcript of what was typed--including passwords. (41) .
Such snooping is possible because each key produces a characteristic dick, shaped by its position on the keyboard, the vigor and hand position of the typist, and the type of keyboard used. But past attempts to decipher keyboard sounds were only modestly successful, requiring a training session in which the computer matched a known transcript to an audio recording of each key being struck. (42) . Furthermore, each new typist or keyboard required a fresh transcript and training session, limiting the method’s appeal to would-be hackers.
Now, in a blow to acoustic security, Doug Tygar and his colleagues at the University of California, Berkeley, have published details of an approach that reaches 96% accuracy, even without a labeled training transcript. (43) . The software tentatively assigns each click a letter based on its frequency, then tests the message created by this assignment using statistical models of the English language. For example, certain letters or words are more likely to occur together-if an unknown keystroke follows a "t", it is much more likely to be an "h" than an "x". Similarly, the words "for example" make likelier bedfellows than "fur example". In a final refinement, the researchers employed a method many students would do well to deploy on term papers., automated spellchecking.
By repeatedly revising unlikely or incorrect letter assignments, Dr. Tygar’s software extracts sense from sonic chaos. That said, the method does have one limitation: in order to apply the language model, at least five minutes of the recorded typing had to be in standard English (though in principle any systematic language or alphabet would work). But once those requirements are met, the program can decode anything from epic prose to randomized, ten-character passwords.
(44) . He says it is quite simple to find the instructions needed to build a parabolic or laser microphone on the web. You could just point one from outside through an office window to make a recording. And as he points out, would-be eavesdroppers might not even need their own recording equipment, as laptop computers increasingly come equipped with built-in microphones that could be hijacked.
(45) . His computers were less successful at parsing recordings made in noisy rooms. Ultimately, though, more sophisticated recording arrays could overcome even background noise, rendering any typed text vulnerable. Dr. Tygar therefore recommends that typed passwords be phased out, to be replaced with biometric checks or multiple types of authorization that combine a password with some form of silent verification (clicking on a pre-chosen picture in a selection of images, for example). Loose lips may still sink ships, but for the moment it seems that an indiscreet keystroke can do just as much damage.
[A] This sort of acoustic analysis might sound like the exclusive province of spies and spooks, but according to Dr. Tygar, such attacks are not as esoteric as you might expect.
[B] The sounds of typing can be decoded, which can be used to decode password, so if you are typing random, secure passwords.
[C] The new approach employs methods developed for speech-recognition software to group together all the similar-sounding keystrokes in a recording, generating an alphabet of clicks.
[D] To protect against these sonic incursions, Dr. Tygar suggests a simple remedy: turn up the radio.
[E] The major advance here is that it no longer requires hours of training the model in order to create a usable mapping of key sounds to letters.
[F] And in contrast to many types of computer espionage, the process is simple, requiring only a cheap microphone and a desktop computer.
[G] Thus schooled, the software could still identify only 80% of the characters in a different transcript of the same typist on the same machine.